Canon imageRUNNER ADVANCE 4551i Service Manual page 68

The shift timing for the Reading Glass is indicated below.
Condition
Wait
Standby
At recovery from sleep mode
At 1-sided reading
At 2-sided reading
At last rotation
Related Error Code
Scanner HP error
• E202-0101: An error occurs during the Glass HP detection operation (outward)
• E202-0102: An error occurs during the Glass HP detection operation (homeward)
■ Pickup Feed System
A list of original size detections is indicated below.
Timing Direction
Feeding starts. Feed
Width
During feed Feed
Width
NOTE:
Normal/mix of same configuration/mix of different configurations: The measurement value is replaced with a fixed size.
Long Original mode (non-fixed detection): The measurement value is used as the original size without changing it.
● Detection when Starting Pickup
Detection in the Feed Direction
The LTR-R/ LGL Sensor (PS_A3) and Large Size/ Small Size Sensor (PS_R3) determine the paper size (large size or small size).
When an original is placed in the Document Pickup Tray, the detection lever of the LTR-R/ LGL Sensor (PS_A3) operates with
the Lightproof Plate and the Lightproof Plate blocks the Photo Interrupter.
ADF Driver PCB
M3
PS_A9 Scanning Glass
Sensor
LTR-R/ LGL Sensor (PS_A3)
Large Size/ Small Size Sensor (PS_R3)
AB/ Inch Sensor (PS_A4)
Original Width Volume (UN_SNS1)
Post-separation Sensor (PS_R1)
Lead Sensor 1 (PS_A6)
Original Size Sensor (UN_BO6)
Reading Glass shift operation
Normal
Yes
Yes
Yes
Yes
Yes
Yes
-
55
2. Technology
Yes
No
Yes
Yes
Yes
No
Mode
Mix of the Mix of dif-
same con- ferent con-
figuration figurations
- -
- -
Yes Yes
Yes Yes
Yes Yes
Yes Yes
- Yes
Long
original
-
-
Yes
Yes
Yes
Yes
-